The desired operating mode is easily selected on a functional wheel and the operation is easily adapted to your needs. The fan has mode for continuous operation which ensures good basic ventilation, mode for on-demand controlled ventilation, and integrated thermostat for transferring excess heat between rooms. Integrated automatic humidity sensor, motion sensor, timer and thermostat. The front is removable for easy cleaning of the fan and duct. Pro7 is very quiet, energy efficient and has high airflow capacity.